Should I tell you something? Argos card offered me that increase not so long ago when I wanted an increase of £2k to buy something from them and also get 12 months interest free.
According to the very vital information they know about me, that is what they could offer me as an increase.
They lost the sale. 
Entirely my own fault but when I first increased my credit limit it automatically suggests £50 more than your current one, but you can scroll and select higher…
However, if you don’t click ‘done’ before you click ‘next’ it stays as the £50 increase.
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The CoOp isn’t an increase, it’s a £50 credit limit! I went for the £15000, because: why not? And got it too.
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I was mad when HSBC made me wait for two days to see the generous £1200 limit they had approved me for. The moment I saw it in the app I immediately called and closed the account before the card was even sent. They asked for reason I said offered limit was unacceptable.
I don’t know what I would do with £50.
Premier black (concierge services) offering 2 free English Heritage tickets (exp 31 May)
Where did you see that? I got an email from them this morning but it only has offers for flowers, jewelry, and fragrances… 
Scroll down - it’s somewhere buried in there